Function regiomontanusHouses

regiomontanusHouses(
    ascendant: number,
    midheaven: number,
    latitude: number,
    obliquity: number,
): HouseCusps
Calculate Regiomontanus house cusps

Divides the celestial equator into 30° segments and projects onto ecliptic. Uses varying pole heights (fh1, fh2) based on latitude.
Parameters
- ascendant: number
  Ascendant in degrees (0-360)
- midheaven: number
  Midheaven in degrees (0-360)
- latitude: number
  Geographic latitude in degrees
- obliquity: number
  Obliquity of ecliptic in degrees
Returns HouseCusps
House cusps (1-12)
Example
```
const asc = 15;
const mc = 285;
const cusps = regiomontanusHouses(asc, mc, 51.5, 23.44);
console.log(cusps.cusps[0]);  // 15 (House 1 = ASC)
```
- Defined in houses/house-systems/regiomontanus.ts:45